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PART-SPECIFIC SOURCE COMPARTMENTALISATION
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=========================================
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The sources for various parts are compartmentalised at two different levels:
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(1) Processor level
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The "processor level" is a CPU core plus the other on-silicon
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peripherals.
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Processor-specific header files are divided among directories in a similar
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way to the CPU level:
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(*) include/asm-mn10300/proc-mn103e010/
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Support for the AM33v2 CPU core.
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The appropriate processor is selected by a CONFIG_MN10300_PROC_YYYY option
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from the "Processor support" choice menu in the arch/mn10300/Kconfig file.
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(2) Unit level
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The "unit level" is a processor plus all the external peripherals
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controlled by that processor.
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Unit-specific header files are divided among directories in a similar way
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to the CPU level; not only that, but specific sources may also be
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segregated into separate directories under the arch directory:
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(*) include/asm-mn10300/unit-asb2303/
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(*) arch/mn10300/unit-asb2303/
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Support for the ASB2303 board with an ASB2308 daughter board.
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(*) include/asm-mn10300/unit-asb2305/
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(*) arch/mn10300/unit-asb2305/
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Support for the ASB2305 board.
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The appropriate processor is selected by a CONFIG_MN10300_UNIT_ZZZZ option
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from the "Unit type" choice menu in the arch/mn10300/Kconfig file.
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============
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COMPILE TIME
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============
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When the kernel is compiled, symbolic links will be made in the asm header file
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directory for this arch:
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include/asm-mn10300/proc => include/asm-mn10300/proc-YYYY/
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include/asm-mn10300/unit => include/asm-mn10300/unit-ZZZZ/
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So that the header files contained in those directories can be accessed without
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lots of #ifdef-age.
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The appropriate arch/mn10300/unit-ZZZZ directory will also be entered by the
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compilation process; all other unit-specific directories will be ignored.
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